87 Monte SS Rear differential Casting Numbers - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-12-2008, 08:28 PM
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87 Monte SS Rear differential Casting Numbers

Hey guys..
any help would be greatly appreciated. I have a 87 Monte SS, unfortunately found out I have a NON posi unit. The casting numbers are

2TF C 302 2

I can't find anything on these numbers as far as axle ratio, or size or anything. I want to stick a posi in it just need to know what size. Thanks again for any help givin.

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Old 06-13-2008, 08:07 PM
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Does the housing have two "fangs" at 5:00 and 7:00 like this one?



If so, it's the GM 7.5" rear end, which is not very strong, but might be OK if you don't beat on it real hard.

You'll need to know what ratio the gears are before buying a posi unit.
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